Add release notes for 0.26 (#529)

This adds release notes for 0.26.

Also:

* Adjust IJ settings to ignore certain http: strings
* Add note about http introduced in 0.26 in message passing api

Co-authored-by: Philip K.F. Hölzenspies <holzensp@gmail.com>

docs/modules/pkl-cli/pages/index.adoc

@@ -178,6 +178,7 @@ Pkl {pkl-version} (Linux, native)
 
 NOTE: We currently do not support the aarch64 architecture for Alpine Linux.
 
+[[windows-executable]]
 === Windows Executable
 
 [source,PowerShell]
@@ -197,6 +198,7 @@ Pkl {pkl-version} (Windows 10.0, native)
 
 NOTE: We currently do not support the aarch64 architecture for Windows.
 
+[[java-executable]]
 === Java Executable
 
 [source,shell]